On the existence of the "classical trajectories" of atoms in the Stern-Gerlach experiment

The widely accepted interpretation of the Stern-Gerlach experiment assumes the objective atomic trajectories (the "classical trajectories") in front of the screen. Following this interpretation, we perform an {\it ab initio} analysis of the experiment and conclude that the objective trajectories do not physically exist. The alternative to our conclusion is substantially to change the model of the experiment.